Question

How would I solve the system of equation for:
x + 4y + z = 12
y - 3z = -7
z = 3

Answer 1

x+4y+3=12
y-9=-7
So y=2
x=1
x=3

Answer 2

Can I have a metal

Answer 3

Substitute the value of z in the second euation to get y,thn substitute both these in first to get x
y -3(3)=-7. x

y-9=-7
y=2.